探究超稳定析氧反应催化剂的稳定演变过程  

Study on the stable evolution process ofhyperstable oxygen evolution catalyst

作　　者：徐文娟 李承睿 李红 王振宇 冯燕茹 杜层层 罗晟尹 孙宏滨[1] XU Wenjuan;LI Chengrui;LI Hong;WANG Zhenyu;FENG Yanru;DU Cengceng;LUO Shengyin;SUN Hongbin(College of science,Northeastern University,Shenyang 110000,China)

机构地区：[1]东北大学理学院,沈阳110000

出　　处：《功能材料》2023年第9期9093-9099,共7页Journal of Functional Materials

基　　金：国家自然科学基金(21872020)。

摘　　要：开发高效析氧反应催化剂,是实现大电流下工业化电解制氢的重要一环。通过简单的浸泡法制备了Mn和Fe改性的泡沫镍(NF),得到了一种大电流下性能优异的析氧反应电催化剂FeMn-NF。该催化剂仅需要252 mV的过电位就能达到500 mA/cm^(2)的电流密度,且稳定运行超过1500 h无衰减,具有超高的性能稳定性。研究发现,在大电流下的析氧反应中,催化剂的表面形貌会发生明显变化,朝着催化更稳定方向的结构演变,活性元素不流失。这种演变有利于催化剂表面的活性物质与基底的结合,同时保证气泡的及时逸出。这种合成简单、成本低廉、性能优异的催化剂是可用于工业电解水制氢的优异催化剂。It is a difficult problem to find a low cost oxygen evolution catalyst which can run stably under large current.To face this challenge,in this paper,we followed the displacement reaction principle to load Mn and Fe on nickel foam(NF)by a simple two-step soaking method to prepare an oxygen evolution reaction electrocatalyst,FeMn-NF,which has excellent performance under large current.The catalyst only needs 252 mV overpotential to reach the current density of 500 mA/cm^(2),and almost no performance attenuate even after stable operation of more than 1500 h,showing ultra-good catalytic stability under large current.Through the analysis of the scanning electron microscope test results of each catalyst after the long-term catalytic oxygen evolution reaction,we found that during the oxygen evolution reaction under large current,the morphology of the catalyst will obviously evolve towards the direction of more stable.Meanwhile,the active element can stably exist without loss.This evolution is conducive to the combination of the active substance on the catalyst surface with the substrate and the smooth release of the reaction product O_(2)bubbles,which is more conducive to the catalyst to maintain the efficient catalytic performance.The simple synthesized catalyst with low cost and excellent performance provides a new concept for the design of industrial oxygen evolution reaction catalysts.

关 键 词：电解制氢 析氧反应 电催化 超高稳定性 形貌演变 

分 类 号：O6-1[理学—化学]